TerraMaster F4-423 review – A low-power 4-bay NAS tested with Unraid

Hey Karl here. The timing couldn’t have been more opportune when I was asked to review the TerraMaster F4-423 4-bay NAS. Let me explain why.

I run Unraid as my OS of choice for my home lab. I have found it easy to maintain and hard to break. My old rig had a 3900X with 3 cores, 6 threads dedicated to docker containers, and the remaining cores running VM’s. It has been a fun and learning experience.

I have run it with several different VM configurations over the past few years. The majority of the time I ran 2 VM’s. One personal and one work and I would RDP over to the work VM. If I wanted to game I had a third gaming VM and allocated all resources to it. It’s not super convenient and as convoluted as it sounds. But recently I moved back to my company-provided laptop and was liking the idea of running bare metal again.

I wanted a dedicated server but had some reservations regarding space, power, and noise. I am not a data hoarder. I have a modest collection of movies and storage is mainly for pictures and home videos. I’m going to share my experience migrating my Unraid server over to the F4-423.

TerraMaster F4-423 specifications

The NAS is driven by an Intel-based Celeron 5095 board which I found wholly adequate for my needs.

TerraMaster F4-423 specifications pulled from the Amazon store:

  • Powerful hardware: N5105/5095 Quad-core 2.0GHz CPU, 4GB RAM DDR4 (expandable up to 32GB). Dual 2.5-Gigabit Ethernet ports – Supports up to 5 Gbps under Link Aggregation. 4-bay NAS designed for SMB high-performance requirements.
  • Maximum internal raw capacity: 80TB (20 TB drive x 4). Compatible with 3.5-inch and 2.5-inch SATA HDD, and 2.5-inch SATA SSD. Supports RAID 0/1/5/6/10, Supports online capacity expansion, and online migration. The built-in M.2 2280 NVMe SSD slot can realize SSD cache acceleration and increase the storage efficiency of the disk array several times.
  • Multiple Backup Solutions: Centralized Backup, Duple Backup, Snapshot, and CloudSync; enhance the safety of your data with multiple backup applications.
  • Easily build file storage servers, mail servers, web servers, FTP servers, MySQL databases, CRM systems, Node.js, and Java virtual machines, as well as a host of other commercial applications.
  • Small-sized compact design that can be used vertically and horizontally. Features an aluminum-alloy shell and intelligent temperature control ultra-quiet fan, good in heat dissipation and Very Quiet.

Unboxing and Teardown

Terramaster F4-423 NAS review

Terramaster F4-423 NAS unboxing

Terramaster F4-423 screw set

Terramaster F4-423 fans &ports
6 screws on the back to teardown. I wish these were captive.

Let’s review external connectivity first.

HDMI 2.0, USB 3.2 Gen 2×1. This offers 10Gbps throughput per port. I only have one high-speed device – the Elgato Camlink 4k –  and during testing ran into no issues. It seems really sensitive to bandwidth limitations and would know it immediately. This was tested passthrough to a Windows VM in Unraid.

Next are two 2.5gbps Ethernet ports. These are using 1 lane each with an Intel i225i chip.

Terramaster F4-423 board

4x SATA board for NAS

The board only supports 2280 NVMe drives. It is missing the standoffs for the shorter drives. I had a couple of 2230 SSD and tested them with Kapton tape.

NAS assemblyTerramaster F4-423 dual fan cooling

Now let’s look at the PCIe config in the BIOS.

Aptio Setup AMI PCI Express configuration

Lanes 1 and 2 are the LAN ports mentioned above.

Lanes 3 and 4 are labeled USB/LAN/UFS. This is what appears to be considered onboard ports and consumes lanes.

Lane 5 and 6 are the M.2 slots.

Lane 7 is the Asmedia ASM1061 providing two additional SATA ports

Lane 8 is not labeled with a very good description. PCI Express Root Port 8. Unused?

PCI Express Root Port 8

PCI Express Link Performance
Source: https://en.wikipedia.org/wiki/PCI_Express

We have PCIe 3.0 which gives us about 0.985 GB/s or 985MB/s or 7.88 Gbps per lane.

M.2 NVMe

This is the only engineering choice that raises a question for me. It looks like the two M.2 NVMe sockets only have one PCIe lane dedicated to each drive. I tried 3 drives and they all peak around this same speed. If unused I wish they used that last lane on one of the drives.
One lane NVMe SSD

CrystalDiskMark SSD performance

CPU usage & power consumption

Predictable and consistent 2.8GHz boost for a few seconds then down to 2.4GHz.

Terramaster F4-423 CPU frequency

Celeron N5095 Processor Load Temperature
I also tracked power for several weeks with a SONOFF Pow.

Terramaster F4-423 power consumption

Lowest wattage idling with Unraid, no drives spun-up, C states enabled on left. Max Wattage 100% load with all drives spun-up with 3 magnetic, one SSD on right.

The daily average for 34 days is 0.449 kWh. This includes all the up-and-down times over those days. I feel like my daily average will be less than 0.4 kWh per day. I did 2 parity checks and believe that is where it looks a little heavy. One I did for migration and another due to a power outage. This takes about 11 hours to complete. I only recently turned on C states in the BIOS and it looks to have reduced power usage a little more. I will need more time to determine exactly how significant and ensure no downsides. Regardless it sips power in my opinion.

Aptio Setup C states

Unraid notes

Here are my notes from migrating my Unraid installation to the TerraMaster F4-423. It was mostly uneventful. First I worked out how to boot Unraid. There is a USB 2.0 Type-A female directly on the board that boots into TerraMaster’s software installer. I thought about extending it outside the case but I have no need right now, but it is an option in the future. I can only foresee adding a Blu-Ray to rip movies and I still have a USB 3.2 available for that. I tinker a lot and for now, I just removed the TerraMaster drive, stored it, and installed my Unraid boot drive in one of the externally available USB ports. The second USB header looks available inside as well if needed.

Terramaster F4-423 internal USB port

I started cautiously and created a new Unraid USB drive to test with and installed one spare hard drive in the enclosure. I went with typical BIOS boot options and Unraid was booting. Posting takes a few seconds longer than on a consumer desktop. I booted and made sure everything was working. After I was confident everything was working as expected I cleaned up my production Unraid drive removing the hardware-specific configs and prepping it for the move. I only missed removing CPU pinning or else it would have been a perfect first boot. I got an error so I booted into safe mode and removed the CPU pinning and all my docker services were restored.

Transcoding videos on the TerraMaster F4-423

Transcoding was easy to enable in Unraid. I installed two plugins through the App Center: ich777’s Intel GPU-TOP which is the only thing that is required, and b3rs3rk’s GPU Statistics for monitoring. Then passthrough /dev/dri to my docker containers. This CPU has been out for a while and all the hard work is done and kinks worked out. I found some older threads and went down some rabbit holes but ultimately above is all that is required.

I only tested Jellyfin and transcoding for the most part was a non-issue. The only caveat is with H.265. My experience did not exactly match what the documentation stated. It is probably a bug. The issue was with 4K H.265 @ 60fps in Chrome as Jellyfin was only able to transcode this file @ locked 45 fps per the log causing issues. But if I kicked it down to 1080 it transcoded @ 30 without pausing (I saw a few updates to Jellyfin and decided to check again. This seems to be a moving target. Now some of the 60fps H.265 files I had issues with are playing in Chrome direct. I did enable Chrome direct HEVC playback originally but it didn’t work. Now it seems to work on some files.) I had no issues with any other codec. That same file streamed to my Shield fine which it should according to the docs. My movies are all in 1080p H.264. I was able to get 6 direct H.264 streams going with Jellyfin. I will never need that many. Max 1 at a time here.

Network Connectivity

I don’t have the network gear to test the 2.5 GbE. Ethernet networking is taken care of by an Intel i225-V chip. It was easy to max out @ gigabit speeds. I did try to link aggregation but I could not get it to work with my Unifi switches. I believe I am going to wait a little while longer before I upgrade my switches. I want to go straight to 10 Gbps but will probably step to 5 Gbps switches first.

Wrap-up and random notes

I have had the F4-423 and tinkered for about 45 days and overall I like it. Small and attractive looking. Quiet and sips power. I was expecting a low-power NAS and that is what I got. Fully decked out you could populate with four 20TB drives and in Unraid you would have 60TB of usable storage. Then a couple of NVME for cache, dockers, and VMs. If we say an average Blu-Ray is 35GB, that would correspond to around 1714 uncompressed movies.

I upgraded the ram with a 16GB 2933 Crucial kit.

Windows boots from an NVMe without issue. The Device Manager was a mess with unknown devices but it booted. I did not test any further than this.

Terramaster F4-423 Unraid

I revisited setting up a LAN cache drive and it worked pretty well but I forgot about the one thing that makes it suck for a permanent setup and that is DNS being a single point of failure.

I wanted to test ripping and transcoding, but don’t have a drive right now. I think it would be a fun project to automate ripping and transcoding movies. From what I am reading this can be completely automated and the TerraMaster F4-423 should handle this fine with hardware transcoding.

The TerraMaster F4-423 NAS can be picked up on Amazon for $499 or purchased directly from TerraMaster for $499.

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5 days ago

I’ve been looking for a box to run Proxmox Backup Server and this could be it since the main storage is going to be 3.5″ HDDs

Karl, would you be willing to flash PBS to a USB drive and try booting it?


4 days ago

But you understand that PBS is just an added repo and a bunch of packages added to an otherwise normal Debian or Proxmox installation?

4 days ago

I will test and get back to you

4 days ago

I’ve bought the TerraMaster F4-423 in May 2022 and tested it with 32GB RAM and TrueNAS Scale (I believe installed on the NVMe SSD), which ran nicely, but I returned it anyway. The main reason I didn’t find it suitable: The setting in the BIOS for which device to boot from was reset after every boot cycle. This meant I could not reboot the device remotely, because I had to use a connected keyboard/monitor to enter the BIOS boot menu to actualy boot TrueNAS Scale every time. I contacted TerraMaster support and they informed me the resetting of the BIOS… Read more »

4 days ago

I will test and reply

4 days ago

To clarify. Mine boots fine from usb without interaction and doesnt reset the bios every boot. I did find it aggressively boots from the Terramaster installation usb until removed.

4 days ago

I had the same problem with my Terramaster F2-423 and OpenMediaVault. For me it helped to reinstall grub with

grub-install /dev/sda –force-extra-removable

I tried TrueNas also but I didn’t have your issue. I’ve only had issues with the date/time settings.

4 days ago

Works with 2x32GB RAM (64 total RAM)

4 days ago

Bios version 2.21.1278 Bio settings do stick with one exception. Booting is not as straight forward. Booting order does appear to be unchangeable. The order seems to be USB > NVME > HD. I was unable to boot from a HD with a NVME that has a bootable partition installed until I disabled the NVME. This was able to be overcome but like Job said it is an attended boot every time. Boot into the bios set the order and it will work for only that boot. It only one partition is present this should not be an issue. Proxmox… Read more »

4 days ago

Conclusion :
To avoid if you care about you data.

Maybe good for a cheap secondary backup of the main Nas where to put replication snapshot.

4 days ago

After reading the CPU data sheet I don’t how even is possible to immagine having 4 X 2.5 Gbe port and 2 nvme ,4 sata ,usb3.1 gen2
Pcie 3.0 Max 8 of PCI Express Lanes
No Lan integration
2 SATA integrated

And ow is possible that that say max supported ram is 32GB when CPU spec says max supported 16GB????

This kind of products are basically legal scams, they give specs that are really misleading for people that have low tech understanding.
if you aren’t afraid of putting 1000$ of hdd on a cheap case, go ahead.

3 days ago

> I don’t how even is possible to immagine having 4 X 2.5 Gbe port and 2 nvme ,4 sata ,usb3.1 gen2

Just read the review above since Karl explained everything. The NVMe SSDs are attached with a single lane only and the two additional SATA ports come from an ancient ASM1061 (making also use of just a single PCIe lane) which is the same chip millions of motherboards with those Intel Atom thingies used already in the last decade two provide two more SATA ports.

3 days ago

> And ow is possible that that say max supported ram is 32GB when CPU spec says max supported 16GB????

That’s because Karl missed 64GB are possible. At least since Gemini Lake the usual formula for those entry-level Intel SoCs is: ‘max capacity by specs’ * 4

But you need to be careful since in the past DIMMs that were too fast (CAS latency too low) resulted in the CPU not booting: Hardkernel wiki. Maybe that’s why Intel plays safe here?

2 days ago

The review could not come at a better time. I was looking for new low power NAS for home usage and if you want more than 2 drives (and you will want more than 2), you will have to make sacrifices because these Intel based Celeron SoCs (no matter the version) can only support 2 native SATA ports. I know that these days a low power NAS is the one you want, especially with the price increase for electricity. I ended up repurposing my old desktop that has an ATX motherboard and kind of doubled my consumption, but I am… Read more »

2 days ago

> these Intel based Celeron SoCs (no matter the version) can only support 2 native SATA ports

Yep and the simple and obvious solution for more SATA ports is to sacrifice a single PCIe lane for an ASM1061 (as it’s done on the F4-423) or better an JMB582 in the meantime (Gen3 x1) to provide two more SATA ports. Or use an JMB585 or ASM1166 for 5/6 ports.

BTW: the Intel SoC’s native SATA ports support SATA PMs so with a cheap JMB575 you can attach 5 SATA devices to each port.

2 days ago

> more than 2 drives (and you will want more than 2)

Nope, why would I? Care to elaborate?

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